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JEE Main levelSingle correct optionDifficulty 2 of 3nm227

What is the IUPAC name of the compound shown? Use the NCERT-style rules: lowest locants, prefixes in alphabetical order.

  1. A2-bromo-3-methyl-4-chloropentane
  2. B2-bromo-2-methyl-4-chloropentane
  3. C2-bromo-4-chloro-3-methylpentane
  4. D4-bromo-2-chloro-3-methylpentane

Answer: C

The compound is 2-bromo-4-chloro-3-methylpentane. Both directions give the locant set {2,3,4}, so the substituent cited first alphabetically (bromo) takes the lower number. The prefixes must also be written in alphabetical order: bromo, chloro, methyl.
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